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300 RUM and Retumbo

 
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  #1  
Old 03-20-2010, 01:15 AM
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300 RUM and Retumbo

Since we are having some beautiful weather, I'm going to play around with some 200gr Gamekings tomorrow. I'm loading up a ladder between 93 and 95gr in 1/2gr jumps. Going to test them at 3.600". Does that sound about normal for Retumbo and 200gr bullets ?
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Old 03-21-2010, 05:57 AM
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Re: 300 RUM and Retumbo

Quikload tells me 95.9 gr Retumbo puts you at max pressure loaded at least 0.020 off the lands, If you are loding on the lands 90gr is the max.

Standard release :This information is provided for your convenience. It is your responsibilty to work your loads up and watch your pressure.
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Old 03-21-2010, 02:12 PM
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Re: 300 RUM and Retumbo

I was able to get 96 gr of Retumbo behind 200 AB's @ about .020 off the lands. 96.5 sometimes showed some slight signs of pressure. My chrony readings were a littel sketchy, but about 3200 fps or so is what I think I was getting. I ran out of 200 AB's and went with my 180 E-Tip load, so I didn't pursue any more development with the 200's.

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Old 03-21-2010, 09:49 PM
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Re: 300 RUM and Retumbo

I was getting 3300'+ with 95 grs. and a 200 AB in a 30" barrel. This was in an 11 twist barrel and 96 grs. was about max. Accuracy was good at 95 grs.........Rich
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Old 03-21-2010, 10:07 PM
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Re: 300 RUM and Retumbo

I have loaded 95grs of Retumbo behind 200 AB out of 26" bbl and it produced 3200 FPS with excellent accuracy .
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Old 03-21-2010, 10:51 PM
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Re: 300 RUM and Retumbo

I have shot 500 rounds of 185 bergers and my throught must me going. I switched to 190s and it came back. group shrunk back down. If you find an accurate load before the max it might be the one to use. I was also told that as a BBL seasons it may change what it likes. In my rifle 3.680 has shot the best for me. 3.80 is jamed with 185`s going to try 210`s this week end. I had no preasure signs with 96.0 gr retumbo and 185,s ... seem like im starting over again. 190 sierra hpbt match shoot the best but im afraid to use them on game.
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Old 03-22-2010, 04:54 PM
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Re: 300 RUM and Retumbo

I ran a ladder test a few weeks ago at 1K using Retumbo and 208 Amax's. My chronograph was reading unreliably so I don't know the velocities, but I started at 94g of Retumbo and ran it 96.5g in .5g increments. Bullet was lightly jammed in the lands.

95 grains was my best 5 shot group. Very little vertical spread and 4 of the 5 shots were inside 5 inches. Under corrected for the wind on one shot that blew my group to 10 inches.

95 grains was a little on the hot side with the 208's
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